Reactive dyes, process for their preparation and the use thereof

ABSTRACT

Reactive dyes of formula ##STR1## wherein Z is a group of formula --CH═CH 2  or --CH 2  --CH 2  --Y, and Y is a leaving group, and K is a radical of formula ##STR2## wherein X is a radical of formula ##STR3## Hal is halogen; and n is 1, 2, 3 or 4; R is hydrogen or unsubstituted or substituted C 1  -C 4  alkyl; R 1  is amino or hydroxyl; R 2  is methyl or carboxyl; and R 3  is hydrogen, C 1  -C 4  alkyl, C 1  -C 4  alkoxy, C 2  -C 4  alkanoylamino, halogen or carboxyl, are particularly suitable for dyeing or printing cellulosic fiber materials or natural or synthetic polyamide fiber materials in high tinctorial yield, and give dyeings and printings with good fastness properties.

The present invention relates to novel reactive dyes, to the preparation thereof and to the use thereof for dyeing or printing fibre materials.

The practice of dyeing with reactive dyes has given rise in recent times to more stringent requirements being made of the quality of the dyeings and to the economy of the dyeing process. For this reason, there is still a need for novel reactive dyes with improved properties, especially application properties.

At the present time it is necessary to provide reactive dyes which have sufficient substantivity and which at the same time have good washing off properties with respect to unfixed dye. The dyes shall have a good tinctorial yield and high reactivity, and they shall also give dyeings with high fixation. The dyes of the prior art do not meet these requirements in all respects.

The present invention therefore has for its object to provide novel improved reactive dyes for dyeing and printing fibre materials and which have the above specified qualities to a high degree. The novel dyes shah be distinguished in particular by excellent fixation yield and superior fibre-dye bond stability, and further they shall have the property of being easily washed off to remove unfixed dye. They shall also produce dyeings with good allround properties, for example lightfastness and wetfastness.

It has been found that this object is substantially achieved with the novel reactive dyes defined below.

Accordingly, the invention relates to reactive dyes of formula ##STR4## wherein Z is a group of formula --CH═CH₂ or --Ch₂ --CH₂ --Y, and Y is a leaving group, and K is a radical of formula ##STR5## wherein X is a radical of formula ##STR6## Hal is halogen; and n is 1, 2, 3 or 4, R is hydrogen or unsubstituted or substituted C₁ -C₄ alkyl,

R₁ is amino or hydroxyl,

R₂ is methyl or carboxyl, and

R₃ is hydrogen, C₁ -C₄ alkyl, C₁ -C₄ alkoxy, C₂ -C₄ alkanoylamino, halogen or carboxyl.

R and R₃ defined as C₁ -C₄ alkyl may each independently of the other suitably be methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl or tert-butyl, preferably methyl.

R defined as C₁ -C₄ alkyl may typically be substituted by sulfo, sulfato, hydroxy, carboxy or C₁ -C₄ alkoxy.

R₃ defined as C₁ -C₄ alkoxy may suitably be methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy or tert-butoxy. Methoxy is preferred.

R₃ defined as C₂ -C₄ alkanoylamino may typically be acetylamino or propionylamino.

Acetylamino is preferred.

R₃ defined as halogen is typically fluoro, bromo or preferably chloro.

Suitable leaving groups Y are for example --Cl, --OSO₃ H, --SSO₃ H, --OCO--CH₃, --OPO₃ H₂, --OCO--CCl₃, --OCO--CHCl₂, --OCO--CH₂ Cl, --OSO₂ -C₁ -C₄ alkyl, --OSO₂ --N(C₁ -C₄ alkyl)₂ or --OCO--C₆ H₅.

Y is preferably a group of formula --Cl, --OSO₃ H, --SSO₃ H, --OCO--CH₃, --OCO--C₆ H₅ or --OPO₃ H₂, more particularly a group of formula --Cl, --OSO₃ H or --OCO--CH₃. Most preferably, Y is a group of formula --OSO₃ H.

Hal may suitably be chloro or bromo, preferably bromo.

R is preferably hydrogen or C₁ -C₄ alkyl, preferably hydrogen.

R₁ is preferably hydroxyl.

R₂ is preferably methyl.

R₃ is preferably hydrogen.

n is preferably 1.

Preferred radicals K of formulae (2) and (3) are those which each contain only one sulfo group.

The reactive dyes of formula (1) preferably contain at least one sulfo group, more particularly 1 to 4 sulfo groups. The reactive dyes of formula (1) most preferably contain 1 or 2 sulfo groups.

Preferred reactive dyes of formula (1) are those in which R is hydrogen or C₁ -C₄ alkyl, preferably hydrogen; R₁ is amino or hydroxyl, preferably hydroxyl; R₂ is methyl or carboxyl, preferably methyl; R₃ is hydrogen; Y is a group of formula --Cl, --OSO₃ H or --OCO--CH₃, preferably a group of formula --OSO₃ H; and n=1. The reactive dyes of formula (1) contain at least one sulfo group, preferably 1 to 4 sulfo groups.

Particularly preferred reactive dyes are those of formula ##STR7## wherein Z and K have the meanings and preferred meanings defined above.

The reactive dyes of this invention preferably contain only one sulfo group in the diazo component.

Particularly preferred radicals K are those of formulae ##STR8## wherein X, R₁ and R₂ have the meanings and preferred meanings defined above.

Preferred radicals K are those of formula (2) and, in particular, the radicals of formula (5).

Very particularly preferred reactive dyes are those of formula ##STR9## wherein X is a radical of formula ##STR10## and Hal is halogen, preferably bromo; and Z is a group of formula --CH═CH₂ or --CH₂ --CH₂ --Y; and Y is a group of formula --Cl, --OSO₃ H or --OCO--CH₃, preferably a group of formula --OSO₃ H.

Very particularly preferred reactive dyes are also those of formula ##STR11## wherein R₁ is amino or hydroxyl,

R₂ is methyl or carboxyl,

X is a radical of formula ##STR12## and Hal is halogen, preferably bromo; and

Z is a group of formula --CH═CH₂ or --CH2--CH2--Y; and Y is a group of formula --Cl, --OSO₃ H or --OCO--CH₃, preferably a group of formula --OSO₃ H.

Reactive dyes of formula (7) are of very particular importance.

In the reactive dyes of this invention, the radical X is preferably the radical of formula ##STR13## wherein Hal is chloro or bromo, preferably bromo.

The radical Z in the novel reactive dyes is preferably the radical of formula --CH═CH₂ or --CH₂ --CH₂ --OSO₃ H. The radical of formula--CH₂ --CH₂ --OSO₃ H is particularly preferred.

Reactive dyes of particular interest are those wherein X is a radical of formula ##STR14## and Hal is halogen, preferably bromo; and Z is a group of formula --CH═CH₂ or --CH₂ --CH₂ --OSO₃ H, preferably a group of formula --CH₂ --CH₂ --OSO₃ H.

The present invention also relates to a process for the preparation of the reactive dyes of formula (1) which comprises diazotising an amine of formula ##STR15## and coupling the diazonium salt so obtained to a compound of formula ##STR16## wherein X, Z, R, R₁, R₂ and R₃ are as defined in formula (1).

The diazotisation of the amine of formula (9) is normally effected by treatment with nitrous acid in an aqueous solution of mineral acid at low temperature, such as 0° to 15° C., and the coupling to the coupling components of formula (10) or (11) is carried out in the acid, neutral or weakly alkaline pH range, preferably at pH 2-8.

In a modified embodiment of the process, a dye is first prepared containing a precursor of the reactive radical which is subsequently converted into the final stage, typically by esterification or by an addition reaction. Typically, a dye containing Z as a radical HO--CH₂ CH₂ -- may be prepared, which product may then be reacted with sulfuric acid to effect conversion of the hydroxy group to the sulfato group. The sulfatation of the hydroxy group is typically effected with concentrated sulfuric acid in the range from c.0° C. to moderately elevated temparature.

In addition, the synthesis may be followed by elimination reactions. Reactive dyes of formula (1) comprising sulfatoethylsulfonyl radicals may be treated with a base such as sodium hydroxide to convert said sulfatoethylsulfonyl radicals to vinylsulfonyl radicals.

In the novel process for the preparation of the reactive dyes of formula ( 1 ), the substituents of the compounds of formulae (9), (10) and (11) have the meanings and preferred meanings defined above.

The compounds of formulae (9), (10) and (11) are known or can be prepared in general accordance with known processes.

The reactive dyes of formula (1) containing a sulfo or sulfato group are obtained either in the form of their free acid or, preferably, as the salts thereof. Suitable salts are typically alkali metal salts, alkaline earth metal salts or ammonium salts, or the salts of an organic amine. Typical examples are the sodium, lithium, potassium or ammonium salts, or the salt of the mono- , di- or triethanolamine.

The reactive dyes of formula (1) are suitable for dyeing and printing a very wide range of materials, such as hydroxyl group-containing or nitrogen-containing fibre materials. Typical examples of such materials are silk, leather, wool, polyamide and polyurethane, and especially cellulosic fibre materials of all kinds. Such cellulosic fibre materials are typically natural cellulosic fibres such as cotton, linen and hemp, as well as cellulose and regenerated cellulose. The reactive dyes of formula (1) are also suitable for dyeing or printing hydroxyl group--containing fibres present in blends, for example blends of cotton with polyamide fibres. In particular, the reactive dyes of formula (1) are suitable for dyeing or printing cellulosic fibre materials or, especially, natural or synthetic polyamide fibre materials.

The reactive dyes of this invention may be applied to and fixed on the fibre material in different manner, preferably in the form of aqueous dye solutions and printing pastes. The novel reactive dyes are suitable both for the exhaust process and for dyeing by the pad dyeing process, in which the goods arc impregnated with aqueous dye solutions, and the dyes are fixed after treatment with alkali, or in the presence of alkali, with or without the application of heat. The dyes of this invention are particularly suitable for the so-called cold pad-batch method, which comprises applying the dye together with the alkali on the pad and subsequently fixing the dye by storing the impregnated goods for several hours at room temperature. After fixation, the dyeings or prints arc thoroughly rinsed with cold and hot water, if necessary with the addition of an agent which acts as a dispersant and promotes the diffusion of unfixed dyes.

The reactive dyes of formula (1) are distinguished by high reactivity, good fixation and exellent build-up. They can therefore be applied by the exhaust process at low dyeing temperatures and require only short steaming times when used in the pad-steam process. The degree of fixation is high, and unfixed dye can be readily washed off. The difference between degree of exhaustion and degree of fixation is remarkably small, i.e. the soap loss is very small. The reactive dyes of formula (1) are also particularly suitable for printing, especially on cotton, and for printing nitrogen-containing fibres, e.g. wool, silk or blends containing wool or silk.

The dyeings and prints obtained with the dyes of this invention have excellent tinctorial strength and excellent dye-fibre bond stability both in the acid and in alkaline medium, and they also have good lightfastness and good wetfastness properties such as fastness to washing, water, sea-water, cross-dyeing and perspiration, as well as good fastness to pleating, ironing and rubbing.

The invention is illustrated by the following Examples in which parts and percentages are by weight, unless otherwise stated. The ratio of parts by weight to parts by volume is the same as that of kilograms to liters.

EXAMPLE 1:22 Parts of the Compound of Formula ##STR17## in 280 parts of a suspension of ice-water are acidified with 18 parts of concentrated aqueous hydrochloric acid and diazotised with 15.6 parts of a 5N solution of sodium nitrite. After stirring for one hour at c. 5°-15° C., excess nitrous acid is destroyed with sulfamic acid. The solution of the diazonium salt so obtained is slowly run at pH 4-5 into a suspension of 22 parts of the coupling component of formula ##STR18## in 100 parts of water. The pH is raised to pH 6-7 by adding sodium hydrogencarbonate and the batch is stirred for 2 hours until coupling is complete. The dye is then subjected to reverse osmosis and lyophilised, giving a dye which in the form of the free acid corresponds to the compound of formula ##STR19## The dye of formula (103) dyes cotton and wool in an orange shade. EXAMPLES 2 to 24:

The reactive dyes of the following Table, column 2, may be obtained in general accordance with the procedure of Example 1. They dye wool and cotton in the shades listed in column 3.

                                      TABLE                                        __________________________________________________________________________     Ex.                                                                               Reactive dye                                Shade                           __________________________________________________________________________         ##STR20##                                  orange                          3                                                                                  ##STR21##                                  red                             4                                                                                  ##STR22##                                  red                             5                                                                                  ##STR23##                                  red                             6                                                                                  ##STR24##                                  red                             7                                                                                  ##STR25##                                  yellow                          8                                                                                  ##STR26##                                  yellow                          9                                                                                  ##STR27##                                  yellow                          10                                                                                 ##STR28##                                  orange                          11                                                                                 ##STR29##                                  orange                          12                                                                                 ##STR30##                                  orange                          13                                                                                 ##STR31##                                  orange                          14                                                                                 ##STR32##                                  red                             15                                                                                 ##STR33##                                  red                             16                                                                                 ##STR34##                                  red                             17                                                                                 ##STR35##                                  red                             18                                                                                 ##STR36##                                  red                             19                                                                                 ##STR37##                                  yellow                          20                                                                                 ##STR38##                                  yellow                          21                                                                                 ##STR39##                                  yellow                          22                                                                                 ##STR40##                                  yellow                          23                                                                                 ##STR41##                                  yellow                          24                                                                                 ##STR42##                                  yellow                          __________________________________________________________________________

Dyeing Procedure I

2 parts of the reactive dye obtained in Example 1 are dissolved in 400 parts of water. To this solution are added 1500 parts of a solution which contains 53 g/l of sodium chloride. 100 parts of cotton fabric are put into this dyebath at 40° C. and, after 45 minutes, 100 parts of a solution containing 16 g/l of sodium hydroxide and 20 g/l of calcined sodium carbonate are added. The temperature of the dyebath is kept for another 45 minutes at 40° C. The dyed goods are then rinsed, soaped at the boil for a quarter of an hour with a non-ionic detergent, rinsed again and dried.

Dyeing Procedure II

A dyebath is prepared from 2000 parts of water, 5 parts of sodium sulfate, 4 parts of sodium acetate, one pan of a levelling agent (based on a condensate of a higher aliphatic amine and ethylene oxide) and 1.9 parts of the reactive dye obtained according to Example 1. The pH of this liquor is adjusted to 5.5 by addition of acetic acid. 100 parts of woolen fabric are put into the liquor so obtained which is then heated over 50 minutes to c. 100° C. After dyeing for 1 hour at this temperature, the dyed goods are rinsed and dried.

Printing Procedure 3 parts of the reactive dye obtained in Example 1 are sprinkled, with rapid stirring, into 100 parts of a stock thickening which contains 50 parts of 5% sodium alginate thickening, 27.8 parts of water, 20 parts of urea, 1 part of sodium m-nitrobenzenesulfonate and 1.2 parts of sodium hydrogen carbonate. A cotton fabric is printed with the printing paste so obtained and dried. The printed fabric is steamed for 2 minutes at 102° C. in saturated steam, then rinsed, if necessary soaped at the boil, then rinsed once more and subsequently dried. 

What is claimed is:
 1. A reactive dye of formula ##STR43## wherein X is a radical of formula ##STR44## and Hal is bromine, andZ is a group of formula --CH═CH₂ or --CH₂ --CH₂ --Y, and Y is a group of formula --Cl, --OSO₃ H or --OCO--CH₃.
 2. A reactive dye according to claim 1, wherein X is a radical of formula ##STR45## and Hal is bromine, and Z is a group of formula --CH═CH₂ or --CH₂ --CH₂ --OSO₃ H.
 3. A process for dyeing or printing hydroxyl group-containing or nitrogen-containing fibre material, which process comprises the step of applying to said fibre material a tinctorial amount of a reactive dye according to claim
 1. 4. A process according to claim 3, wherein said fibre material is cellulosic fibre material or natural or synthetic polyamide fibre material. 